window-list: Only show at the end of the overview transition

gnome-shell now considers the work area in the overview, so popping
up at the beginning of the overview transition is now more jarring
than at the end.

Part-of: <https://gitlab.gnome.org/GNOME/gnome-shell-extensions/-/merge_requests/185>

extensions/window-list/extension.js

@@ -778,7 +778,7 @@ class WindowList extends St.Widget {
             this._updateKeyboardAnchor();
         });
 
-        this._overviewHidingId = Main.overview.connect('hiding', () => {
+        this._overviewHidingId = Main.overview.connect('hidden', () => {
             this.visible = !Main.layoutManager.primaryMonitor.inFullscreen;
             this._updateKeyboardAnchor();
         });